Dynamics of Mx+ Salts of Fatty Acids Adsorption onto Metallic Ores

Abstract

Abstract-Iron ore as possible adsorbent for metallic salts of fatty acid (M x+ -SFA) oils was investigated. Experimental constants from several kinetic models were used to interpret M x+ -SFA uptake. Mode of diffusion was also studied. Applicability tests for adopted models favors the Pseudo second order kinetics which presented high R 2 values > of 0.9; high precision or least qcal/qexp values of ratio within 1.0 for the K + -SFA, Ca 2+ -SFA and Al 3+ -SFA sorption. The Pseudo second order equation also gave least values for the three error functions viz: 9.6×10 -4 to 5.4×10 -3 , 3.1×10 -2 to 7.4×10 -2 and 4.6×10 -3 to 2.5 ×10 -3 for EABS, SSE and X 2 respectively. Multiple linearity presented by intra-particle diffusion plots is of three distinct stages of linear initial, linear intermediate and linear last portions. These stages are coupled with the nonpassage of lines through the origin being an indication that other diffusion models such as mass transfer or film diffusion exists and that the intra-particle diffusion is not the only rate factor controlling M x+ -SFA sorption.

Removal of Methylene Blue From Aqueous Solution Using Activated Rice Husk Biochar: Adsorption Isotherms, Kinetics and Error Analysis

“…Chemisorption of gas onto solid sorbents as described by Elovic kinetic model is represented in equation 14 [5,18] as shown in Table 2. 14 The constants α and β represents Elovic constants for initial adsorption rate (mg/gmin -1 ) and the degree of surface coverage and activation energy for chemisorption (g/mg) respectively. From Table 5 and Figure 23, the slope and intercept of the linearized plot of q t versus In t are 0.88 and 0.78 respectively and the regression coefficients from the simulated data was high and of good fitting (R 2 =0.9459).…”

“…Recently, the development and use of various adsorption materials, techniques and technologies for the removal of contaminants from aqueous media have increased [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] . Many researchers [15][16][17][18][19][20][21][22][23][24][25][26][27] have used many agricultural based waste materials such as Retama Raetam plant, saw dust, wheat bran, Jatropha Curcas and Terminalia Catappa and unmodified saw dust as an alternative cheaper and affordable substitute for application as sorbent for adsorption of contaminants from aqueous media. Rice husks are waste materials from rice processing and are usually discarded indiscriminately or burnt sometimes leading to eutrophication and green house aerosols, carbon (IV) oxide, carbon(II)oxide, methane, nitrogen oxides and volatile organics which present serious health and climatic changes [27][28][29][30][31][32][33][34][35][36] Varieties of synthetic anionic and cationic dyes are routinely used by chemical industries such as leather, textile, printing, food, pulp and paper [27] .…”